Smoke-consuming furnace.



N0. 66!,379. f Patentd Nov. 6, 1900. W. E. MINSHALL.

SMOKE CONSUNHNG FURNACE. 4

(Application filed July 12, 1900.)

2 Sheets8heat 1.

(No Model.)

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No. 661,379. Patented Nov. 6, I900.

W. E. MINSHALL.

SMOKE CONSUMING FURNACE.

(Application filed July 12, 1900.;

(No Model.) 2 Sheets-8heet 2.

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rirn to T @Eo WILLIAM ELLIS MINSHALL, OF MINONK, ILLINOIS.

SMOKE-CONSUMING FURNACE.

SPECIFICATION forming part of Letters Patent No. 661,379, dated November 1 Application filed July 12, 1.900. Serial No. 28,396. (No model.)

To (tlZ whom it may concern: WhlGh take through apertures c in the one Be it known that l, WILLIAM ELLIS MIN- and slots 6' in the other after the manner SHALL, a citizen of the United States, residshown in Figs. 2 and 5. They are provided 55 ing at Minonk, in the county of Woodford and with apertured lugsf for the passage of bolts,

5 State of Illinois, have invented new and usethrough the medium of which they are conful Improvements in Smoke-Consuming Furnected to the faceplate a and secured in p0- naces, of whichthe followingisaspecification. sition on the wall C, and they are also pro- My invention relates to improvements in vided with ports or passages E F, arranged in 60 that class of furnaces which are provided with the manner illustratedthat is to say, each smoke-consuming means; and it consists in of the end sections D hasa port or passage E, the combination, with the fire-box or combuswhich is flared or gradually increased in size lion-chamber of a furnace, of a smoke-confrom its outer to its inner end, while each of sumer, thenovelty, utility, and advantagesof the intermediate sections or castings D is 65 which will be fully understood from the folprovided with a port or passage E, similar to lowing description and claims when taken in those of the end sections or castings,'and also connection with the accompanying drawings, with a port or passage F, which is gradually in whichdiminished in size from its outer to its inner Figure l is a front elevation of so much of end. 7 asteam-boilerfurnace as is necessary to illus- While I have shown and described four trate my improved smoke consuming means, castings D D, it is obvious that more or less the cold-air-induction conduit of such means of the same may be employed, according to being shown partly in section. Fig. 2 is an the size of the furnace to be equipped with enlarged detail horizontal section taken in myimprovements,andit will also be observed 75 the plane indicated by the broken line 2 2 of that by virtue of the slots 8 a series of con- Fig. 1 and illustrating one-half of my imnected castings may be adjusted as to length proved smoke-consumer-that is, the half of in order to properly fit a furnace. the same at the left of the median line of the G H designate the hot-air chamber and furnace. Fig. 3 is a detail longitudinal and cold-air chamber, respectively, of the smoke- 80 vertical section taken in the plane indicated consumer the said chambers being by prefby the broken line 3 of Fig. 1. Fig. 4 is a erence inclosed in a singlecasing I and sepdetail perspective view ofa series of connectarated by a longitudinal central partitioned castings which are embodied in my imwall g, as shown in Figs. 2 and 3. The coldprovements and form part of the front wall air chamber H is connected with the ports 85 of the fire-box or combustion-chamberof the or passages E, and hence with the firebox, v

furnace. Fig. 5 is a transverse section taken by tubes h, which extend from the partitioir in the plane indicated by the broken line 5 5 wall g inwardly to a position within the enof Fig. landillustratingt-hemannerin which largements 'i at the outer ends of the said the lapped rabbeted ends of the castings are passages E. Thehot-airchamberis connected 90 connected. with the firebox by the passages F and the 40 In the said drawings similar letters of refpassages IE, it being connected with the latter erence designate corresponding parts in all by the enlargements i at the outer ends of of the several views, referring to whichthe same. Said hot-ai r chamber is also con- A is the firebox or combustion-chainber of nected at its ends with the interior of the the 5 the steam-boiler furnace. Bis the boiler. 0 box by return passages or conduits J. These 5 is the front wall, provided with the usual passages or conduitsJai-e shown in the form face-plate a, ash-doors b, and fire-doors c, and of tubes open at their inner ends and comm u- D D are end and intermediate castings which nicating at their outer ends with the hot-air are embodied in my improvements and are chamber; but it is obviousthat they might be 100 arranged end to end upon and form part of formed in the side walls of the furnace, in

the front wall 0, as shown. The said castwhich event they would be connected wit-h ings have theirends rabbeted and lapped and the fire-box by a single large opening or a connected through the medium of bolts (1, plurality of small openings, as preferred.

K is a cold-air-supply conduit. This cond uit K communicates with the cold-air chamher and extends downwardly from the same and thepce by preference underground to a suitable well or pit, (not shown,) down into which it is carried a suitable distance. The location of the receiving end of the cold-airsupply conduit in a well or pit has for its purpose to afford a strong draft, and it. will be readily observed that the greater the distance the pipe K is carried below the cold-air chamber H the greater will be the draft afforded.

L is a steam-supply pipe which is connected at one or both of its ends to the boiler B and has a transverse portion j disposed in front of the casing I and equipped with suitable valves 7t 7t.

Mrepresents jet-tubes,which are connected to the valves 76 and extend therefrom through the cold-air chamber H to a point within the tubes 72, and N represents pipes which are connected to the valves and extend therefrom through the cold and hot airchambers and into the passages F and have crooks at their ends, so as to enable them to discharge outwardlyin said passages F. By virtue of the transverse portion of the steam-supply pipe L being provided with the valves 7c 7r it will be seen that the boiler-pressure is brought. very near to the discharges, and by virtue of the provision of the valves it it will be observed that the passages E may be changed from hot-air passages into cold-ai'r passages, and vice versa, by simply closing and opening the said valves 70.

In the practical operation of my improvements steam from the boiler passes through the pipe L and valves 70 and is discharged through the jet-tubes M into the tubes 7t and thence into the passages E, with the result that suction is created in the passages E, which causes the cold and hot air to be drawn into said passages E and discharged therefrom, with the steam, into and far across the upper portion of the firebox. From this it follows that suction is also created in the hotair chamber G, which operates to draw the hot gases from the upper part of the fire-box through theconduits J into the hot-air chamber, wherein said hot gases are commingled with air and from which they are drawn by the suction in the passages E, before described. The air that is admitted to the fire-box through the dampers in the doors is, together with more or less of the hot gases, also drawn through the passages E into the hot-air chamber G, from whence it is discharged through the passages E, as before described. The pipes N have for their purpose to discharge steam into the chamber G, and thereby increase the suction created therein.

It will be appreciated from the foregoing that the carbonic acid and carbonic monoxid are drawn from the furnace into the hot-air chamber G and are mixed with the nitrogen ends of the passages E discharged in a broad thin sheet into the upper portion of the fireucts of combustion are consumed.

The draft of cold air up the conduit K and from thence through the cold-air chamber II and tubes h assists materially in creating a suction in the passages E and the hot-air chamberand may, when desired, be depended on to draw the hot gases, smoke, and other products back from the fire-box into the hotair and mixing chamber G. I prefer, however, to also employ steam for creating the suction stated; but itis obvious that by virtue of the cold-air draft much less steam need be employed than would otherwise be the case.

When desired, two additional cold-air-supply pipes, one at each end of the cold-air chamber, may be employed. I prefer, however, to employ but a single cold-air-supply pipe, as shown, and have therefore deemed it unnecessary to illustrate the additional pipes mentioned.

When desirable, the suction created by the draft of cold air in the passages E maybe depended upon to draw the carbonic acid, carbonic monoxid, and other products of combustion from the fire-box back into the hot-air chamber, wherein they will be commingled with the nitrogen of the air and the hydrogen, in which case only sufficieut steam to form an element of combustion need be supplied.

The arrangement of the valves 70 near the discharge-points carries the boiler-pressure very near said discharge-points, as before described, which contributes to the even distribution of the steam into the fire-box.

The passages J enable the suction created in the hot-air chamber G to draw the gases and products of combustion from the rear portion of the fire-box into the said chamber, while the passages F serve for the passage of products of combustion from the front portion of thefire-box into said chamber.

When desired, the hot and cold air chambers may be arranged at the inner side of the face-plate of the furnace, in which event it will only be necessary to form holes in said plate large enough for the passage of the jettubes.

Having described my invention, what I claim, and desire to sccu re by Letters Patent, 1s

1. In a smoke-consuming furnace, the combin ation of afire-box or combustion-chamber, a hot-air chamber, passages connecting the hot-air chamber and the interior of the firebox or combustion-chamber, a cold-air chantber open to the atmosphere, and one or more passages leading from said cold-air chamber into one or more of the passages intermediate of the hot-air chamber and fire-box.

2. In a smoke-consuming furnace, the combination of a fire-box or combustion-chamber, a hot-air chamber, a cold-air chamber, a coldair-supply conduit open to the atmosphere box, with the result that all smoke and prod- IIO and leading from a point below the cold-air chamber to said chamber, passages intermediate of the hotair chamber and the fire-box or com lmstion-chamber, and one or more passages leading from the cold-air chamber into one or more of the passages between the hotair chamber and fire-box.

3. In a smoke-consuming furnace, the combination of a firebox, a hot-air chamber disposed transversely in front of the fire-box and in a plane above the grate thereof, a cold air chamber arranged parallel to the hot-air chamber and adjacent thereto; said cold-air chamber being open to the atmosphere, passages intermediate of the hot-air chamberand the fire-box, and a passage leading from the cold-air chamber into one of the passages intermediate of the hot-air chamber and firebox, substantially as specified.

4. In a smoke-consuming furnace, the combination of a fire-box, a hot-air chamber, a passage leading from the hot-air chamber to the fire-box, a return-passage leading from the fire-box above the fire to the hot-air cham ber, a cold-air chamber open to the atmosphere, a passage leading from the cold-air ch am her i nto the first-named passage between the hot-air chamberand fire-box, and a steampipe having a jet arranged to discharge into the passage between the cold-air chamber and the passage leading from the hot-air chamber into the fire-box, substantially as specified.

5. In a smoke-consuming furnace, the combination of a fire-box, a hot-air chamber, passages intermediate of the fire-box and the hotair chamber, a cold-air chamber open to the atmosphere, a passage leading from the coldair chamber into one of the passages between the hot-ai r chamber and the fire-box, a steampipe having a jet arranged to discharge into the passage between the cold-air chamber and the passage leading from the hot -air chamber to the fire-box, and a pipe leading from the steam-pipe into one of the passages between the hot-air chamber and the fire-box and arranged to discharge into said passage in a direction away from the fire-box, substantially as specified.

6. In asmoke-consuming furnace, the combination of a fire-box, a hot-air chamber, a passage leading from the hot-air chamber to the fire-box, a return-passage leading from the fire-box to the hot-air chamber, a cold-air chamber open to the atmosphere, a passage leading from the cold-air chamber into the t1 rst-n amed passage between the hot-air chamber and the fire-box, a steam-pipe, a jet-tube arranged to discharge into the passage be tween the cold-air chamber and the passage leading from the hot-air chamber into the fire-box, and a valve interposed between the steam-pipe and the jet-tube, substantially as specified.

'7. In a smoke-consuming furnace, the combination of a fire'box, a hot-air chamber, passages intermediate of the fire-box and the hotair chamber, a passage open to the atmosphere and leading into one of the passages between the hot-air chamber and the firebox, a steam-supply pipe, and a jet-tube arranged to discharge into the tube co|nmunieating with a source of air-supply.

8. In a smoke-consuming furnace, the combination of a lire-box, a hot-air chamber, passages intermediate of the fire-box and the hotair chamber, a passage leading from the at mosphere intqone of the passages between the hot-air chamber and fire-box, a steamsupply pipe, a jet-tube arranged to discharge into the passage communicating with the atmosphere, and a valve interposed between the supply-pipe and the jet-tube, substantially as specified.

9. In a smoke-consuming furnace, the combination of a fire-box, a hot-air chamber, passages intermediate of the hot-air chamber and fire-box, a cold-air chamber, a cold-air-supply conduit having its receiving end open to the atmosphere located considerably below the cold-airehamber, and a passage leading from the cold-air chamber into one of the passages between the hot-air chamber and the fire-box.

10. In a smoke consuming furnace, the combination of a firebox, a hot-air chamber, passages intermediate of the hot-air chamber and fire'box, a cold-air chamber, a cold-airsupply conduit having its receiving end loca ted considerably below the cold-air chamber and open to the atmosphere, a passage leading from the cold-air chamber into one of the passages between the hot-air chamber and the fire-box, and suitable means for supplying steam to the passage leading from the cold-air chamber, substantially as specified.

11. In a smoke-consuming furnace, the combination of a firebox, a hot-air chamber disposed transversely in front of the fire box and in a plane above the grate thereof, a cold air chamber arranged parallel to the hot-ai r chamber and adjacent thereto; said cold-air chamber being open to the atmosphere, passages intermediate of the hot-air chamber and the fire-box, one or more tubes leading from the cold-air chamber into said passages, a steam-supply pipe, and one or more jets connected therewith and arranged to discharge into one or more of the said tubes, substantially as specified.

12. In a smokeconsuming furnace, the combination of a firebox, a casing disposed transversely in front of the fire-box and in a plane above the grate thereof, and containing a longitudinal hot-air chamber connected by openings With the ii re-box, a cold-airohanr ber open to the atmosphere and separated from the hot-air chamber by a longitudinal partition, tubes communicating with the coldair chamber and extending into the openings between the hot-air chamber and the fire-box, and a steam-pipe having jets arranged in the said tubes, substantially as specified.

13. In a smoke consuming furnace, the combination of a fire-box, and a plurality of castings forming part of one of the walls of the fire-box, and having their contiguous ends rabbeted and lapped and also having apertures in the one and slots in the other; said castings being provided With passages, and bolts extending through the apertures and slots of the castings, and connecting the same, substantially as specified.

14. In a smoke-consuming furnace, the combination of a fire-box, a plurality of castiugs arranged end to end and forming part of the front Wall of the fire-box; said castings having passages extending from their outer to their inner sides, a casing arranged at the outer side of the castings, and containing hot and cold air chambers; the hotair chamber being in communication with the WILLIAM ELLIS MINSHALL.

Witnesses:

ROBERT C. GoLLIDAY, THOMAS J. SUMNER. 

